// import { Injectable } from '@nestjs/common';
// import { Book1Dto } from './dto/book1.dto';

// @Injectable()
// export class BookService {
//   private books: Book1Dto[] = [
//     { id: 1, title: 'NestJS 入门指南', author: '张三', price: 49.9 },
//     { id: 2, title: 'TypeScript 编程', author: '李四', price: 59.9 },
//     { id: 3, title: 'Node.js 实战', author: '王五', price: 69.9 },
//   ];

//   findAll(): Book1Dto[] {
//     return this.books;
//   }

//   findOne(id: number): Book1Dto | string {
//     const book = this.books.find(book => book.id === id);
//     return book || '图书不存在';
//   }
// }